diff --git a/README.md b/README.md
index f23be05..c33ba55 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,8 @@ This will create a namespaced, unminified build of dat.GUI at `build/dat.gui.mai
  * Using common.js
  * Using webpack for build
  * Fixed an issue with colors based on arrays - https://github.com/dataarts/dat.gui/pull/57
-
+ * Update factory.js, Step param was not used - https://github.com/dataarts/dat.gui/pull/45
+ 
 ### 0.5
  * Moved to requirejs for dependency management.
  * Changed global namespace from *DAT* to *dat* (lowercase).
diff --git a/build/dat.gui.js b/build/dat.gui.js
index 2dd2620..5bb12f2 100644
--- a/build/dat.gui.js
+++ b/build/dat.gui.js
@@ -4209,40 +4209,47 @@ return /******/ (function(modules) { // webpackBootstrap
 	    BooleanController = __webpack_require__(8),
 	    common = __webpack_require__(5);
 
-	    module.exports = function(object, property) {
+	module.exports = function (object, property) {
 
-	  var initialValue = object[property];
+	    var initialValue = object[property];
 
-	  // Providing options?
-	  if (common.isArray(arguments[2]) || common.isObject(arguments[2])) {
-	    return new OptionController(object, property, arguments[2]);
-	  }
-
-	  // Providing a map?
-
-	  if (common.isNumber(initialValue)) {
-
-	    if (common.isNumber(arguments[2]) && common.isNumber(arguments[3])) {
-	      // Has min and max.
-	      return new NumberControllerSlider(object, property, arguments[2], arguments[3]);
-
-	    } else {
-
-	      return new NumberControllerBox(object, property, { min: arguments[2], max: arguments[3] });
+	    // Providing options?
+	    if (common.isArray(arguments[2]) || common.isObject(arguments[2])) {
+	        return new OptionController(object, property, arguments[2]);
 	    }
-	  }
 
-	  if (common.isString(initialValue)) {
-	    return new StringController(object, property);
-	  }
+	    // Providing a map?
 
-	  if (common.isFunction(initialValue)) {
-	    return new FunctionController(object, property, '');
-	  }
+	    if (common.isNumber(initialValue)) {
+
+	        if (common.isNumber(arguments[2]) && common.isNumber(arguments[3])) {
+
+	            // Has min and max.
+	            if (common.isNumber(arguments[4])) // has step
+	                return new NumberControllerSlider(object, property, arguments[2], arguments[3], arguments[4]);
+	            else
+	                return new NumberControllerSlider(object, property, arguments[2], arguments[3]);
+
+	        } else {
+
+	            return new NumberControllerBox(object, property, {min: arguments[2], max: arguments[3]});
+
+	        }
+
+	    }
+
+	    if (common.isString(initialValue)) {
+	        return new StringController(object, property);
+	    }
+
+	    if (common.isFunction(initialValue)) {
+	        return new FunctionController(object, property, '');
+	    }
+
+	    if (common.isBoolean(initialValue)) {
+	        return new BooleanController(object, property);
+	    }
 
-	  if (common.isBoolean(initialValue)) {
-	    return new BooleanController(object, property);
-	  }
 	};
 
 /***/ },
diff --git a/build/dat.gui.min.js b/build/dat.gui.min.js
index 13b94cf..f8a65f2 100644
--- a/build/dat.gui.min.js
+++ b/build/dat.gui.min.js
@@ -1,2 +1,2 @@
 !function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):"object"==typeof exports?exports.dat=t():e.dat=t()}(this,function(){return function(e){function t(i){if(n[i])return n[i].exports;var o=n[i]={exports:{},id:i,loaded:!1};return e[i].call(o.exports,o,o.exports,t),o.loaded=!0,o.exports}var n={};return t.m=e,t.c=n,t.p="",t(0)}([function(e,t,n){e.exports=n(1)},function(e,t,n){e.exports={color:{Color:n(2),math:n(6),interpret:n(3)},controllers:{Controller:n(7),BooleanController:n(8),OptionController:n(10),StringController:n(11),NumberController:n(12),NumberControllerBox:n(13),NumberControllerSlider:n(14),FunctionController:n(20),ColorController:n(21)},dom:{dom:n(9)},gui:{GUI:n(22)}}},function(e,t,n){function 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L.addClass(i,"folder"),n},open:function(){this.closed=!1},close:function(){this.closed=!0},onResize:function(){var e=this.getRoot();if(e.scrollable){var t=L.getOffset(e.__ul).top,n=0;O.each(e.__ul.childNodes,function(t){e.autoPlace&&t===e.__save_row||(n+=L.getHeight(t))}),window.innerHeight-t-D<n?(L.addClass(e.domElement,U.CLASS_TOO_TALL),e.__ul.style.height=window.innerHeight-t-D+"px"):(L.removeClass(e.domElement,U.CLASS_TOO_TALL),e.__ul.style.height="auto")}e.__resize_handle&&O.defer(function(){e.__resize_handle.style.height=e.__ul.offsetHeight+"px"}),e.__closeButton&&(e.__closeButton.style.width=e.width+"px")},remember:function(){if(O.isUndefined(T)&&(T=new S,T.domElement.innerHTML=g),this.parent)throw new Error("You can only call remember on a top level GUI.");var e=this;O.each(Array.prototype.slice.call(arguments),function(t){0==e.__rememberedObjects.length&&l(e),-1==e.__rememberedObjects.indexOf(t)&&e.__rememberedObjects.push(t)}),this.autoPlace&&c(this,this.width)},getRoot:function(){for(var e=this;e.parent;)e=e.parent;return e},getSaveObject:function(){var e=this.load;return e.closed=this.closed,this.__rememberedObjects.length>0&&(e.preset=this.preset,e.remembered||(e.remembered={}),e.remembered[this.preset]=u(this)),e.folders={},O.each(this.__folders,function(t,n){e.folders[n]=t.getSaveObject()}),e},save:function(){this.load.remembered||(this.load.remembered={}),this.load.remembered[this.preset]=u(this),f(this,!1),this.saveToLocalStorageIfPossible()},saveAs:function(e){this.load.remembered||(this.load.remembered={},this.load.remembered[V]=u(this,!0)),this.load.remembered[e]=u(this),this.preset=e,h(this,e,!0),this.saveToLocalStorageIfPossible()},revert:function(e){O.each(this.__controllers,function(t){this.getRoot().load.remembered?s(e||this.getRoot(),t):t.setValue(t.initialValue)},this),O.each(this.__folders,function(e){e.revert(e)}),e||f(this.getRoot(),!1)},listen:function(e){var t=0==this.__listening.length;this.__listening.push(e),t&&_(this.__listening)}}),e.exports=U},function(e,t){e.exports='<div id=dg-save class="dg dialogue">Here\'s the new load parameter for your <code>GUI</code>\'s constructor:<textarea id=dg-new-constructor></textarea><div id=dg-save-locally><input id=dg-local-storage type="checkbox"> Automatically save values to <code>localStorage</code> on exit.<div id=dg-local-explain>The values saved to <code>localStorage</code> will override those passed to <code>dat.GUI</code>\'s constructor. This makes it easier to work incrementally, but <code>localStorage</code> is fragile, and your friends may not see the same values you do.</div></div></div>'},function(e,t,n){var i=n(25);"string"==typeof i&&(i=[[e.id,i,""]]);n(19)(i,{});i.locals&&(e.exports=i.locals)},function(e,t,n){t=e.exports=n(18)(),t.push([e.id,".dg ul{list-style:none;margin:0;padding:0;width:100%;clear:both}.dg.ac{position:fixed;top:0;left:0;right:0;height:0;z-index:0}.dg:not(.ac) .main{overflow:hidden}.dg.main{-webkit-transition:opacity .1s linear;transition:opacity .1s linear}.dg.main.taller-than-window{overflow-y:auto}.dg.main.taller-than-window .close-button{opacity:1;margin-top:-1px;border-top:1px solid #2c2c2c}.dg.main ul.closed .close-button{opacity:1!important}.dg.main .close-button.drag,.dg.main:hover .close-button{opacity:1}.dg.main .close-button{-webkit-transition:opacity .1s linear;transition:opacity .1s linear;border:0;position:absolute;line-height:19px;height:20px;cursor:pointer;text-align:center;background-color:#000}.dg.main .close-button:hover{background-color:#111}.dg.a{float:right;margin-right:15px;overflow-x:hidden}.dg.a.has-save>ul{margin-top:27px}.dg.a.has-save>ul.closed{margin-top:0}.dg.a .save-row{position:fixed;top:0;z-index:1002}.dg li{-webkit-transition:height .1s ease-out;transition:height .1s ease-out}.dg li:not(.folder){cursor:auto;height:27px;line-height:27px;overflow:hidden;padding:0 4px 0 5px}.dg li.folder{padding:0;border-left:4px solid transparent}.dg li.title{cursor:pointer;margin-left:-4px}.dg .closed li:not(.title),.dg .closed ul li,.dg .closed ul li>*{height:0;overflow:hidden;border:0}.dg .cr{clear:both;padding-left:3px;height:27px}.dg .property-name{cursor:default;float:left;clear:left;width:40%;overflow:hidden;text-overflow:ellipsis}.dg .c{float:left;width:60%}.dg .c input[type=text]{border:0;margin-top:4px;padding:3px;width:100%;float:right}.dg .has-slider input[type=text]{width:30%;margin-left:0}.dg .slider{float:left;width:66%;margin-left:-5px;margin-right:0;height:19px;margin-top:4px}.dg .slider-fg{height:100%}.dg .c input[type=checkbox]{margin-top:9px}.dg .c select{margin-top:5px}.dg .cr.boolean,.dg .cr.boolean *,.dg .cr.function,.dg .cr.function *,.dg .cr.function .property-name{cursor:pointer}.dg .selector{display:none;position:absolute;margin-left:-9px;margin-top:23px;z-index:10}.dg .c:hover .selector,.dg .selector.drag{display:block}.dg li.save-row{padding:0}.dg li.save-row .button{display:inline-block;padding:0 6px}.dg.dialogue{background-color:#222;width:460px;padding:15px;font-size:13px;line-height:15px}#dg-new-constructor{padding:10px;color:#222;font-family:Monaco,monospace;font-size:10px;border:0;resize:none;box-shadow:inset 1px 1px 1px #888;word-wrap:break-word;margin:9pt 0;display:block;width:440px;overflow-y:scroll;height:75pt;position:relative}#dg-local-explain{display:none;font-size:11px;line-height:17px;border-radius:3px;background-color:#333;padding:8px;margin-top:10px}#dg-local-explain code{font-size:10px}#dat-gui-save-locally{display:none}.dg{color:#eee;font:11px 'Lucida Grande',sans-serif;text-shadow:0 -1px 0 #111}.dg.main::-webkit-scrollbar{width:5px;background:#1a1a1a}.dg.main::-webkit-scrollbar-corner{height:0;display:none}.dg.main::-webkit-scrollbar-thumb{border-radius:5px;background:#676767}.dg li:not(.folder){background:#1a1a1a;border-bottom:1px solid #2c2c2c}.dg li.save-row{line-height:25px;background:#dad5cb;border:0}.dg li.save-row select{margin-left:5px;width:81pt}.dg li.save-row .button{margin-left:5px;margin-top:1px;border-radius:2px;font-size:9px;line-height:7px;padding:4px 4px 5px;background:#c5bdad;color:#fff;text-shadow:0 1px 0 #b0a58f;box-shadow:0 -1px 0 #b0a58f;cursor:pointer}.dg li.save-row .button.gears{background:#c5bdad url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAANCAYAAAB/9ZQ7AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAQJJREFUeNpiYKAU/P//PwGIC/ApCABiBSAW+I8AClAcgKxQ4T9hoMAEUrxx2QSGN6+egDX+/vWT4e7N82AMYoPAx/evwWoYoSYbACX2s7KxCxzcsezDh3evFoDEBYTEEqycggWAzA9AuUSQQgeYPa9fPv6/YWm/Acx5IPb7ty/fw+QZblw67vDs8R0YHyQhgObx+yAJkBqmG5dPPDh1aPOGR/eugW0G4vlIoTIfyFcA+QekhhHJhPdQxbiAIguMBTQZrPD7108M6roWYDFQiIAAv6Aow/1bFwXgis+f2LUAynwoIaNcz8XNx3Dl7MEJUDGQpx9gtQ8YCueB+D26OECAAQDadt7e46D42QAAAABJRU5ErkJggg==) 2px 1px no-repeat;height:7px;width:8px}.dg li.save-row .button:hover{background-color:#bab19e;box-shadow:0 -1px 0 #b0a58f}.dg li.folder{border-bottom:0}.dg li.title{padding-left:1pc;background:#000 url(data:image/gif;base64,R0lGODlhBQAFAJEAAP////Pz8////////yH5BAEAAAIALAAAAAAFAAUAAAIIlI+hKgFxoCgAOw==) 6px 10px no-repeat;cursor:pointer;border-bottom:1px solid hsla(0,0%,100%,.2)}.dg .closed li.title{background-image:url(data:image/gif;base64,R0lGODlhBQAFAJEAAP////Pz8////////yH5BAEAAAIALAAAAAAFAAUAAAIIlGIWqMCbWAEAOw==)}.dg .cr.boolean{border-left:3px solid #806787}.dg .cr.color{border-left:3px solid}.dg .cr.function{border-left:3px solid #e61d5f}.dg .cr.number{border-left:3px solid #2fa1d6}.dg .cr.number input[type=text]{color:#2fa1d6}.dg .cr.string{border-left:3px solid #1ed36f}.dg .cr.string input[type=text]{color:#1ed36f}.dg .cr.boolean:hover,.dg .cr.function:hover{background:#111}.dg .c input[type=text]{background:#303030;outline:0}.dg .c input[type=text]:hover{background:#3c3c3c}.dg .c input[type=text]:focus{background:#494949;color:#fff}.dg .c .slider{background:#303030;cursor:ew-resize}.dg .c .slider-fg{background:#2fa1d6}.dg .c .slider:hover{background:#3c3c3c}.dg .c .slider:hover .slider-fg{background:#44abda}",""])},function(e,t,n){var i=n(10),o=n(13),r=n(14),s=n(11),a=n(20),l=n(8),d=n(5);e.exports=function(e,t){var n=e[t];return d.isArray(arguments[2])||d.isObject(arguments[2])?new i(e,t,arguments[2]):d.isNumber(n)?d.isNumber(arguments[2])&&d.isNumber(arguments[3])?d.isNumber(arguments[4])?new r(e,t,arguments[2],arguments[3],arguments[4]):new r(e,t,arguments[2],arguments[3]):new o(e,t,{min:arguments[2],max:arguments[3]}):d.isString(n)?new s(e,t):d.isFunction(n)?new a(e,t,""):d.isBoolean(n)?new l(e,t):void 0}},function(e,t){e.exports=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(e,t){window.setTimeout(e,1e3/60)}}},function(e,t,n){var i=n(9),o=n(5),r=function(){this.backgroundElement=document.createElement("div"),o.extend(this.backgroundElement.style,{backgroundColor:"rgba(0,0,0,0.8)",top:0,left:0,display:"none",zIndex:"1000",opacity:0,WebkitTransition:"opacity 0.2s linear",transition:"opacity 0.2s linear"}),i.makeFullscreen(this.backgroundElement),this.backgroundElement.style.position="fixed",this.domElement=document.createElement("div"),o.extend(this.domElement.style,{position:"fixed",display:"none",zIndex:"1001",opacity:0,WebkitTransition:"-webkit-transform 0.2s ease-out, opacity 0.2s linear",transition:"transform 0.2s ease-out, opacity 0.2s linear"}),document.body.appendChild(this.backgroundElement),document.body.appendChild(this.domElement);var e=this;i.bind(this.backgroundElement,"click",function(){e.hide()})};r.prototype.show=function(){var e=this;this.backgroundElement.style.display="block",this.domElement.style.display="block",this.domElement.style.opacity=0,this.domElement.style.webkitTransform="scale(1.1)",this.layout(),o.defer(function(){e.backgroundElement.style.opacity=1,e.domElement.style.opacity=1,e.domElement.style.webkitTransform="scale(1)"})},r.prototype.hide=function(){var e=this,t=function(){e.domElement.style.display="none",e.backgroundElement.style.display="none",i.unbind(e.domElement,"webkitTransitionEnd",t),i.unbind(e.domElement,"transitionend",t),i.unbind(e.domElement,"oTransitionEnd",t)};i.bind(this.domElement,"webkitTransitionEnd",t),i.bind(this.domElement,"transitionend",t),i.bind(this.domElement,"oTransitionEnd",t),this.backgroundElement.style.opacity=0,this.domElement.style.opacity=0,this.domElement.style.webkitTransform="scale(1.1)"},r.prototype.layout=function(){this.domElement.style.left=window.innerWidth/2-i.getWidth(this.domElement)/2+"px",this.domElement.style.top=window.innerHeight/2-i.getHeight(this.domElement)/2+"px"},e.exports=r}])});
\ No newline at end of file
diff --git a/src/dat/controllers/factory.js b/src/dat/controllers/factory.js
index 6ff2d19..3b2a0cc 100644
--- a/src/dat/controllers/factory.js
+++ b/src/dat/controllers/factory.js
@@ -19,38 +19,45 @@ var OptionController = require('./OptionController'),
     BooleanController = require('./BooleanController'),
     common = require('../utils/common');
 
-    module.exports = function(object, property) {
+module.exports = function (object, property) {
 
-  var initialValue = object[property];
+    var initialValue = object[property];
 
-  // Providing options?
-  if (common.isArray(arguments[2]) || common.isObject(arguments[2])) {
-    return new OptionController(object, property, arguments[2]);
-  }
-
-  // Providing a map?
-
-  if (common.isNumber(initialValue)) {
-
-    if (common.isNumber(arguments[2]) && common.isNumber(arguments[3])) {
-      // Has min and max.
-      return new NumberControllerSlider(object, property, arguments[2], arguments[3]);
-
-    } else {
-
-      return new NumberControllerBox(object, property, { min: arguments[2], max: arguments[3] });
+    // Providing options?
+    if (common.isArray(arguments[2]) || common.isObject(arguments[2])) {
+        return new OptionController(object, property, arguments[2]);
     }
-  }
 
-  if (common.isString(initialValue)) {
-    return new StringController(object, property);
-  }
+    // Providing a map?
 
-  if (common.isFunction(initialValue)) {
-    return new FunctionController(object, property, '');
-  }
+    if (common.isNumber(initialValue)) {
+
+        if (common.isNumber(arguments[2]) && common.isNumber(arguments[3])) {
+
+            // Has min and max.
+            if (common.isNumber(arguments[4])) // has step
+                return new NumberControllerSlider(object, property, arguments[2], arguments[3], arguments[4]);
+            else
+                return new NumberControllerSlider(object, property, arguments[2], arguments[3]);
+
+        } else {
+
+            return new NumberControllerBox(object, property, {min: arguments[2], max: arguments[3]});
+
+        }
+
+    }
+
+    if (common.isString(initialValue)) {
+        return new StringController(object, property);
+    }
+
+    if (common.isFunction(initialValue)) {
+        return new FunctionController(object, property, '');
+    }
+
+    if (common.isBoolean(initialValue)) {
+        return new BooleanController(object, property);
+    }
 
-  if (common.isBoolean(initialValue)) {
-    return new BooleanController(object, property);
-  }
 };
\ No newline at end of file